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RAID - Frequently Asked Questions


If I have a single big capacity hard drive then why to use RAID instead of Hard drives?

Is it possible to recover data easily through RAID?

What is Disk Striping and its importance in Data Recovery?

Can I configure a single RAID array so that more than one computer can be connected to it, is there any security measures associated with this?

If multiple drives fails or other serious problems occur in a RAID, what should I do?

What is the method to implement RAID?

What happens when hard disk fails?

What should I do if I had a RAID Failure?

What can be the reason to have RAID Failure?


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If I have a single big capacity hard drive then why to use RAID instead of Hard drives?

RAID (Redundant Array of Inexpensive Disks) systems are faster and more durable than single large hard disk drives. A RAID system stripes or mirrors your data across multiple hard disk drives. Therefore, when you access your data, all the disks are working at the same time, giving a major increase in speed. The RAID hardware controller also contains a large memory cache which dramatically increases performance.

Is it possible to recover data easily through RAID?

A RAID system uses the capacity of one disk to retain parity information for the other disks, so that if any disk fails, the contents of the failed disk can be automatically reconstructed from the data on the other disks. Even with a failed disk, the data in the RAID array can still be fully accessed.

What is Disk Striping and its importance in Data Recovery?

This is a method of combining multiple drives into one logical storage unit. Striping partitions the storage space of each drive into stripes, which can be as small as one sector (512 bytes) or as large as several megabytes. These stripes are then interleaved in a rotating sequence, so that the combined space is composed alternately of stripes from each drive.

RAID that uses striping complicates data recovery significantly. The data is no longer placed in relatively simple fashion on a single hard disk, but rather, distributed across many drives. Despite this complication, it is possible to do data recovery in most cases; it just costs more due to the complexity of the array.

Can I configure a single RAID array so that more than one computer can be connected to it, is there any security measures associated with this?

One way is to use multiple SCSI host channels on the RAID controller to connect to several host computers. One RAID set can be partitioned into several disks, and any of these disks can be mapped to a number of different channels or to different SCSI IDs.

Care should be taken to ensure that the same file cannot be accessed by more than one computer simultaneously. If different computers try to write to the same file simultaneously the data on the disk could become corrupted.

If multiple drives fails or other serious problems occur in a RAID, what should I do?

Under such circumstances, if you fail to make a proper backup, you may have to call a data recovery company. Many have high success rates when it comes to RAID data recovery. Using specialized facilities, equipment, and software, they can even recover data from a moribund hard drive.

What is the method to implement RAID?

There are two ways to implement a RAID:

Hardware RAID: This RAID is created by a RAID controller, and appears as one hard drive to any operating system. This type requires a RAID controller but provides the ability to use it under any operating system.

Software RAID: This RAID is created by the operating system's hard disk driver, and is visible as RAID only to this operating system.

What happens when hard disk fails?

Because of parity, information all data are available in case one of the disks fails. If extra disks are available, then reconstruction will begin immediately after the device failure. However if two hard disks fail at same time, all data are LOST. In short RAID can survive one disk failure, but not two or more.

What should I do if I had a RAID Failure?

Evaluation is an extensive analysis of your media, to determine:

  • Turn off your RAID array server immediately.
  • Document the series of events that occurred causing RAID failure.
  • Contact Data Recovery Team immediately.

What can be the reason to have RAID Failure?

There can be many reasons for RAID failure. Hardware failure is the most common reason and usually results from disk or controller problems. Abrupt power failure is another reason for RAID failure, because it can disrupt logical volumes and destroy the RAID file system structure in place.

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